Section IV. OPERATOR'S MAINTENANCE INSTRUCTIONS

TM 1 1-5820-554-12

developed is connected to one input of the difference

the ujt firing circuit. Filtered, regulated d.c. voltage is

amplifier to supply a stable bias point.

supplied to the difference amplifier and reference

circuit.

8-13. Feedback Circuit

8-15. Harmonic Filter Network

The feedback circuit supplies a d.c. signal voltage,

proportional to the output voltage, to the difference

The harmonic distortion in the solatron autotransformer

amplifier. The voltage level of the feedback signal is

network output is reduced to less than 12 percent by the

adjusted by the potentiometer. This potentiometer is

harmonic filter network. Its output is applied to the

factory-adjusted to give nominal voltage, and should

load and to the output voltage feedback circuit.

not require further adjustment.

8-14. D.C. Supply for Control Circuits

Unfiltered, regulated d.c. voltage is supplied to

Section IV. OPERATOR'S MAINTENANCE INSTRUCTIONS

8-16. General

Paragraphs 3-19 through 3-22 cover operator's maintenance duties. Paragraph 3-24 covers cleaning.

8-17. Operator's Preventive Maintenance Checks and Service Chart for

Regulator, Voltage, CN-1146/FRC-93

Item

Interval

Equipment is not ready/

No.

available if:

Item to be inspected

Procedures

Regulator loading

Apply known load to output

Regulator fails to maintain steady

of regulator and check for

load voltage

voltage change.

Section V. ORGANIZATIONAL MAINTENANCE INSTRUCTIONS

8-18. General

Organizational maintenance instructions are covered in paragraphs 3-25, 3-26, and 3-27. Touchup painting is

covered in paragraph 3-29.

8-19. Organizational Preventive Maintenance Checks and Services Chart for Regulator,

Voltage CN-1146/FRC-93

W-Weekly

M-Monthly

Q-Quarterly

Item

Interval

No.

Item to be inspected

Procedures

Regulator stability

Apply known load to regulator and check output voltage

stability

Change generator output frequency

Output voltage will remain stable with input power frequency

slightly by reducing engine rpm.

change.

Change 6 8-6